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| 1 /* crypto/des/cfb_enc.c */ | |
| 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) | |
| 3 * All rights reserved. | |
| 4 * | |
| 5 * This package is an SSL implementation written | |
| 6 * by Eric Young (eay@cryptsoft.com). | |
| 7 * The implementation was written so as to conform with Netscapes SSL. | |
| 8 * | |
| 9 * This library is free for commercial and non-commercial use as long as | |
| 10 * the following conditions are aheared to. The following conditions | |
| 11 * apply to all code found in this distribution, be it the RC4, RSA, | |
| 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
| 13 * included with this distribution is covered by the same copyright terms | |
| 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
| 15 * | |
| 16 * Copyright remains Eric Young's, and as such any Copyright notices in | |
| 17 * the code are not to be removed. | |
| 18 * If this package is used in a product, Eric Young should be given attribution | |
| 19 * as the author of the parts of the library used. | |
| 20 * This can be in the form of a textual message at program startup or | |
| 21 * in documentation (online or textual) provided with the package. | |
| 22 * | |
| 23 * Redistribution and use in source and binary forms, with or without | |
| 24 * modification, are permitted provided that the following conditions | |
| 25 * are met: | |
| 26 * 1. Redistributions of source code must retain the copyright | |
| 27 * notice, this list of conditions and the following disclaimer. | |
| 28 * 2. Redistributions in binary form must reproduce the above copyright | |
| 29 * notice, this list of conditions and the following disclaimer in the | |
| 30 * documentation and/or other materials provided with the distribution. | |
| 31 * 3. All advertising materials mentioning features or use of this software | |
| 32 * must display the following acknowledgement: | |
| 33 * "This product includes cryptographic software written by | |
| 34 * Eric Young (eay@cryptsoft.com)" | |
| 35 * The word 'cryptographic' can be left out if the rouines from the library | |
| 36 * being used are not cryptographic related :-). | |
| 37 * 4. If you include any Windows specific code (or a derivative thereof) from | |
| 38 * the apps directory (application code) you must include an acknowledgement: | |
| 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
| 40 * | |
| 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND | |
| 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
| 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 51 * SUCH DAMAGE. | |
| 52 * | |
| 53 * The licence and distribution terms for any publically available version or | |
| 54 * derivative of this code cannot be changed. i.e. this code cannot simply be | |
| 55 * copied and put under another distribution licence | |
| 56 * [including the GNU Public Licence.] | |
| 57 */ | |
| 58 | |
| 59 #include "e_os.h" | |
| 60 #include "des_locl.h" | |
| 61 #include <assert.h> | |
| 62 | |
| 63 /* The input and output are loaded in multiples of 8 bits. | |
| 64 * What this means is that if you hame numbits=12 and length=2 | |
| 65 * the first 12 bits will be retrieved from the first byte and half | |
| 66 * the second. The second 12 bits will come from the 3rd and half the 4th | |
| 67 * byte. | |
| 68 */ | |
| 69 /* Until Aug 1 2003 this function did not correctly implement CFB-r, so it | |
| 70 * will not be compatible with any encryption prior to that date. Ben. */ | |
| 71 void DES_cfb_encrypt(const unsigned char *in, unsigned char *out, int numbits, | |
| 72 long length, DES_key_schedule *schedule, DES_cblock *ivec, | |
| 73 int enc) | |
| 74 { | |
| 75 register DES_LONG d0,d1,v0,v1; | |
| 76 register unsigned long l=length; | |
| 77 register int num=numbits/8,n=(numbits+7)/8,i,rem=numbits%8; | |
| 78 DES_LONG ti[2]; | |
| 79 unsigned char *iv; | |
| 80 #ifndef L_ENDIAN | |
| 81 unsigned char ovec[16]; | |
| 82 #else | |
| 83 unsigned int sh[4]; | |
| 84 unsigned char *ovec=(unsigned char *)sh; | |
| 85 | |
| 86 /* I kind of count that compiler optimizes away this assertioni,*/ | |
| 87 assert (sizeof(sh[0])==4); /* as this holds true for all, */ | |
| 88 /* but 16-bit platforms... */ | |
| 89 | |
| 90 #endif | |
| 91 | |
| 92 if (numbits<=0 || numbits > 64) return; | |
| 93 iv = &(*ivec)[0]; | |
| 94 c2l(iv,v0); | |
| 95 c2l(iv,v1); | |
| 96 if (enc) | |
| 97 { | |
| 98 while (l >= (unsigned long)n) | |
| 99 { | |
| 100 l-=n; | |
| 101 ti[0]=v0; | |
| 102 ti[1]=v1; | |
| 103 DES_encrypt1((DES_LONG *)ti,schedule,DES_ENCRYPT); | |
| 104 c2ln(in,d0,d1,n); | |
| 105 in+=n; | |
| 106 d0^=ti[0]; | |
| 107 d1^=ti[1]; | |
| 108 l2cn(d0,d1,out,n); | |
| 109 out+=n; | |
| 110 /* 30-08-94 - eay - changed because l>>32 and | |
| 111 * l<<32 are bad under gcc :-( */ | |
| 112 if (numbits == 32) | |
| 113 { v0=v1; v1=d0; } | |
| 114 else if (numbits == 64) | |
| 115 { v0=d0; v1=d1; } | |
| 116 else | |
| 117 { | |
| 118 #ifndef L_ENDIAN | |
| 119 iv=&ovec[0]; | |
| 120 l2c(v0,iv); | |
| 121 l2c(v1,iv); | |
| 122 l2c(d0,iv); | |
| 123 l2c(d1,iv); | |
| 124 #else | |
| 125 sh[0]=v0, sh[1]=v1, sh[2]=d0, sh[3]=d1; | |
| 126 #endif | |
| 127 if (rem==0) | |
| 128 memmove(ovec,ovec+num,8); | |
| 129 else | |
| 130 for(i=0 ; i < 8 ; ++i) | |
| 131 ovec[i]=ovec[i+num]<<rem | | |
| 132 ovec[i+num+1]>>(8-rem); | |
| 133 #ifdef L_ENDIAN | |
| 134 v0=sh[0], v1=sh[1]; | |
| 135 #else | |
| 136 iv=&ovec[0]; | |
| 137 c2l(iv,v0); | |
| 138 c2l(iv,v1); | |
| 139 #endif | |
| 140 } | |
| 141 } | |
| 142 } | |
| 143 else | |
| 144 { | |
| 145 while (l >= (unsigned long)n) | |
| 146 { | |
| 147 l-=n; | |
| 148 ti[0]=v0; | |
| 149 ti[1]=v1; | |
| 150 DES_encrypt1((DES_LONG *)ti,schedule,DES_ENCRYPT); | |
| 151 c2ln(in,d0,d1,n); | |
| 152 in+=n; | |
| 153 /* 30-08-94 - eay - changed because l>>32 and | |
| 154 * l<<32 are bad under gcc :-( */ | |
| 155 if (numbits == 32) | |
| 156 { v0=v1; v1=d0; } | |
| 157 else if (numbits == 64) | |
| 158 { v0=d0; v1=d1; } | |
| 159 else | |
| 160 { | |
| 161 #ifndef L_ENDIAN | |
| 162 iv=&ovec[0]; | |
| 163 l2c(v0,iv); | |
| 164 l2c(v1,iv); | |
| 165 l2c(d0,iv); | |
| 166 l2c(d1,iv); | |
| 167 #else | |
| 168 sh[0]=v0, sh[1]=v1, sh[2]=d0, sh[3]=d1; | |
| 169 #endif | |
| 170 if (rem==0) | |
| 171 memmove(ovec,ovec+num,8); | |
| 172 else | |
| 173 for(i=0 ; i < 8 ; ++i) | |
| 174 ovec[i]=ovec[i+num]<<rem | | |
| 175 ovec[i+num+1]>>(8-rem); | |
| 176 #ifdef L_ENDIAN | |
| 177 v0=sh[0], v1=sh[1]; | |
| 178 #else | |
| 179 iv=&ovec[0]; | |
| 180 c2l(iv,v0); | |
| 181 c2l(iv,v1); | |
| 182 #endif | |
| 183 } | |
| 184 d0^=ti[0]; | |
| 185 d1^=ti[1]; | |
| 186 l2cn(d0,d1,out,n); | |
| 187 out+=n; | |
| 188 } | |
| 189 } | |
| 190 iv = &(*ivec)[0]; | |
| 191 l2c(v0,iv); | |
| 192 l2c(v1,iv); | |
| 193 v0=v1=d0=d1=ti[0]=ti[1]=0; | |
| 194 } | |
| 195 | |
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Chromium Code Reviews
Issue 2072073002:
Delete bundled copy of OpenSSL and replace with README. (Closed)
Base URL: https://chromium.googlesource.com/chromium/deps/openssl@master